The Tiffen 4.5" round Neutral Density Solid 2.1 filter has multiple uses and offers the possibility of achieving results otherwise impossible. , , It allows the photographer to adjust exposure without affecting colour balance. An ND filter appears grey and reduces the amount of light reaching either a digital camera sensor or the film plane of a traditional camera., , A Neutral Density filter is used to create unusual special effects such as capturing the "blur" of rippling water in a waterfall or the swirling effect of urban traffic. , , As it allows the use of slower shutter speeds in bright light, it becomes possible to create these special effects that would normally not be possible to capture without the filter. , , And, as it can also help control your depth of field, it allows you to photograph with wider apertures. Ultimately, its value lies in helping to prevent bright and excessively washed-out images taken in bright light., , A Neutral Density 2.1 filter (7 stops) creates such a distinction between foreground and background that your subject will be completely isolated from the rest of the image. , , Water will appear to flow at a rapid rate even though, in reality, it was just a trickle. Using this filter on a very sunny beach with high ISO sensitivity will prevent the shot from being completely washed out and overexposed., Water White glass is characterised by high transmission quality. As a rule, it will transmit 98 to 99% of light , , It also has an anti-reflective quality that makes it useful in a wide range of applications, including the film industry, shop windows and art exhibitions. , , The glass is virtually flawless and is becoming increasingly prevalent in digital equipment., , , Neutral Density filters have four main uses, - Allow the use of slow shutter speeds, particularly with high ISO sensitivities, to record movement of subjects such as waterfalls, clouds or cars, - Decrease depth of field by allowing the use of wider apertures, which helps to separate subjects from their background, - Decrease the effective ISO sensitivity of fast films (above 400 ISO) and allow their use outdoors in bright situations, - Allow cine and video cameras (which have fixed shutter speeds) to film subjects such as snow, sand or other bright scenes that could cause overexposure, , Superior quality, - Major Hollywood film studios rely on Tiffen filters for their multi-million-pound productions. The superior quality and design make Tiffen the overwhelming choice of filmmakers, professional photographers and even NASA, - Tiffen has also received an Emmy from the Academy of Television Arts and Sciences for its engineering excellence